Ottimo elenco di VoipGuides. Twinkle sembra un’ottima applicazione da aggiungere alla nostra rassegna di software VoIP per Linux, Windows e Mac.

1) Twinkle: Perhaps the most widely used Linux based SIP softphone. Twinkle only supports Linux and its totally open source SIP Client. Some of the interesting features of Twinkle, I would like to highlight.

a)Supports upto 2 parallel lines.
b)Multiple active call identities
c)3-way conference calling
d)Inband DTMF
e)Out-of-band DTMF (SIP INFO)
f)STUN support for NAT traversal
g)Secure voice communication by ZRTP/SRTP
h)Available as Firefox Extension- TwinkleFox

2) opensoftphone: This SIP softphone is written in Java as an eclipse RCP. It uses the pjsip SIP stack for connecting to SIP servers. The phone runs on Windows and Linux. The phone is tailored to be used in a Callcenter environment based on asterisk. Strongly recommended for Small Business Usage and not recommended for personal use coz it lacks basic features.

3)Ekiga (GnomMeeting): One of the best SIP Softphones around in the market today. It supports VoIP and video conferencing using H.323 and SIP protocols. You can also get a Free SIP address with Ekiga.net

Some Major Features of Ekiga:

a) supports many audio and video codecs, and is interoperable with other SIP compliant software
b) support for the G.722 audio codec: Now supports HD Voice by Polycom.
c) ENUM support
d) Transparent NAT Support using STUN
e) Line Monitoring

4) Linphone: linphone works under Linux and Windows XP and its open-source.

Features of Linphone:
a)Works on Linux, OpenBSD, FreeBSD and Windows versions
b)SIP proxy support: registrar, proxies, with digest authentication
c)IPv6 support
d)STUN support for traversal of UDP NATs

5) X-lite for Linux: Yes, Good old X-lite is also available for Linux. Do we really have to talk about this award winning and most widely used SIP softphone in the world. Its just perfect for newbies, easy to use and easy to configure. Read our X-lite Configuration Guide.

X-lite Features:
a)Enhanced Quality of Service (QoS) for voice & video calls
b)Multi-party and ad hoc Voice and Video Conferencing [IP & PSTN]
c)Voice & Video Call Recording
d)Very Easy Interface for SIP Account Configuration

Via Best SIP Softphones for VOIP on Linux